<!doctype html>
<meta charset=utf-8>
<script src="../testcommon.js"></script>
<body>
<script>
'use strict';

function getMarginLeft(cs) {
  return parseFloat(cs.marginLeft);
}

async_test(function(t) {
  var div = addDiv(t);
  var cs = window.getComputedStyle(div);

  div.style.marginLeft = '0px';
  cs.marginLeft; // Flush style to set up transition start point
  div.style.transition = 'margin-left 100s';
  div.style.marginLeft = '10000px';
  cs.marginLeft;

  var animation = div.getAnimations()[0];
  assert_equals(getMarginLeft(cs), 0,
                'Initial value of margin-left is zero');
  var previousAnimVal = getMarginLeft(cs);

  animation.ready.then(waitForFrame).then(t.step_func(function() {
    assert_true(getMarginLeft(cs) > previousAnimVal,
                'margin-left is initially increasing');
    animation.pause();
    return animation.ready;
  })).then(t.step_func(function() {
    previousAnimVal = getMarginLeft(cs);
    return waitForFrame();
  })).then(t.step_func(function() {
    assert_equals(getMarginLeft(cs), previousAnimVal,
                  'margin-left does not increase after calling pause()');
    previousAnimVal = getMarginLeft(cs);
    animation.play();
    return animation.ready.then(waitForFrame);
  })).then(t.step_func(function() {
    assert_true(getMarginLeft(cs) > previousAnimVal,
                'margin-left increases after calling play()');
    t.done();
  }));
}, 'pause() and play() a transition');

done();
</script>
</body>
